I set up a guardian farm using a dimchest to collect with the hope of being able to then have a linked chest deposit into my storage system. Unfortunately, after setting up the chest, when I return the overworld I see no items flowing in, even while I'm at my farm and see guardians making their way through the system. Is this intended, or is there some way to override this and prevent the locking from occurring? If not, is there a plan to address this moving forward?

I did not understand what you mean... The dimchest set on collect does not take items from entities but from inventories such as chest, barrels, furnaces...

I apologize, to be more clear I have a hopper that runs into the dimchest, however it stops receiving items from the hopper when I go through a nether portal. It's currently set to idle, not collecting.

You probably don't have a chunk loader that loads that zone